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Leases Lease Terms Details (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Leased Assets [Line Items] |  |  |
Operating Leases, Rent Expense, Net | $ 2,833,000 | $ 2,720,000 | $ 2,620,000
Minimum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Term of Lease | one year |  |
Renewal Term of Lease | one year |  |
Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Term of Lease | fifteen years |  |
Renewal Term of Lease | five years |  |

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- Definition Number of years in Renewal Term of Lease + References No definition available. + Details
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- Definition Length of Term of Lease + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |